I am planning on forming a brick arch for my under stand wood storage. I was planning on framing the corner with hardibacker attached to 1x1. Does the hardibacker cut with a jigsaw- I have never used the stuff before?
Thanks,

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Why don't you use a router a zipsaw? Best way to cut round shapes. Just make a jig to keep you perfectly round. I am in the process of doing the exact same thing (a brick arch for the wood storage). I used MDF as it cuts much easier and I only need it to to hold up long enough for my mortar to dry. I will attempt to post some pics tomorrow but I've not tried adding pics yet. In the meantime you can check out my gallery photos posted in my signature line?

I'm pretty sure you can buy cement board jigsaw blades and they are only a few dollars. I've used a circular saw many times for straight cuts (with a cement board blade) and diamond impregnated holes saws for plumbing cutouts. Cement board circular saw blades are pretty cheap ($10?).....the diamond holes saw are a different story - $20 and up, each.
Try Lowes or Home Depot for the jig saw blades, I am pretty sure I have seen them, I believe they were from Bosch.

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